.TH std::bitset::to_ullong 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::bitset::to_ullong \- std::bitset::to_ullong

.SH Synopsis
   unsigned long long to_ullong() const  \fI(since C++11)\fP
                                         (constexpr since C++23)

   Converts the contents of the bitset to an unsigned long long integer.

   The first bit of the bitset corresponds to the least significant digit of the number
   and the last bit corresponds to the most significant digit.

.SH Parameters

   \fI(none)\fP

.SH Return value

   The converted integer

.SH Exceptions

   std::overflow_error if the value can not be represented in unsigned long long.

.SH Example


// Run this code

 #include <bitset>
 #include <iostream>
 #include <limits>

 int main()
 {
     std::bitset<std::numeric_limits<unsigned long long>::digits> b
     (
         0x123456789abcdef0LL
     );

     std::cout << b << "  " << std::hex << b.to_ullong() << '\\n';
     b.flip();
     std::cout << b << "  " << b.to_ullong() << '\\n';

     std::bitset<std::numeric_limits<unsigned long long>::digits + 1> q{0};
     try
     {
         (~q).to_ullong(); // throws
     }
     catch (const std::overflow_error& ex)
     {
         std::cout << "ex: " << ex.what() << '\\n';
     }
 }

.SH Output:

 0001001000110100010101100111100010011010101111001101111011110000  123456789abcdef0
 1110110111001011101010011000011101100101010000110010000100001111  edcba9876543210f
 ex: _Base_bitset::_M_do_to_ullong

.SH See also

   to_string returns a string representation of the data
             \fI(public member function)\fP
   to_ulong  returns an unsigned long integer representation of the data
             \fI(public member function)\fP
